How to use it
- Enter length in feet
- Enter width in feet
- Enter thickness in inches
- Click calculate to see cubic yards, cubic feet, and bag count
Enter the length, width and thickness of the slab you’re pouring and the calculator instantly shows three key numbers: total cubic feet, cubic yards, and how many 80‑lb bags you’ll need. Knowing the exact yardage helps you order the right amount of mix, avoiding costly over‑orders or shortfalls that delay the job. The cubic‑feet result is the raw volume; divide by 27 to see cubic yards, the unit most suppliers quote. Then the bag count is simply the cubic‑feet volume divided by 0.6 ft³ per bag, rounded up. Use these figures to plan budget, schedule deliveries, and communicate with your crew. The tool works for patios, driveways, footings, or any flat concrete pour. You can also save the results or print them for on‑site reference, making it easy to verify orders with your supplier.
Pro tips
- Add 5‑10% extra for waste to avoid running short
- Round bag count up to the next whole bag; you can’t buy a fraction
- Order bags in multiples of a full pallet for better pricing
- Double‑check thickness conversion; 1 in = 0.0833 ft
Real-life examples
- A homeowner estimating bags for a 10 ft × 12 ft patio 4‑in thick
- A contractor planning concrete footings for a new deck
- A landscaper needing volume for a garden path pour
Case study
Sam needed a 12 ft × 8 ft slab 4 in thick for a garage floor. Using the calculator, he saw he required 2.4 cubic yards, which translated to 13 bags. He ordered 13 bags, avoided extra trips, and finished on schedule.